Water acidification, in most cases, is associated with anthropogenic emissions of sulfur and nitrogen oxides and is addressed from a global perspective. Owing to their common occurrence and sensitivity, early developmental forms of Lymnaea stagnalis can be a valuable new tool in biomonitoring of the freshwater environment.Īcidification and ammonia contamination of water resources are currently recognized as serious environmental problems. Compared with Daphnia magna, relatively low concentrations of toxicants caused a lethal effect on embryonic and juvenile organisms of the great pond snail. It is highly cost-effective due to simple and efficient breeding and the small size of the organisms in the bioassay population. The highest toxicity is shown by ammonium hydroxide with LC 50/24h values, respectively, 24.27 for embryos and 24.72 for juvenile forms, and the lowest is shown by nitric acid ions with LC 50/24h values, respectively, 105.19 for embryos and 170.47 for juvenile forms. Our study showed that the early developmental stages of Lymnaea stagnalis are very sensitive bioindicators, making it possible to detect even very low levels of the above-mentioned water toxicants. The probit method was used as a parametric statistical procedure to estimate LC 50 and the associated 95% confidence interval. The assessment of toxicity impact was supported by microscopic observations.
The toxicity of the substances was classified according to different scales and the test’s sensitivity was compared to that of the commonly used bioindicator Daphnia magna Straus. Tests were conducted in 5–10 replications for each toxicant. Sulfuric acid, nitric acid, and ammonium hydroxide were used as waterborne toxicants in laboratory experiments. The paper presents a study leading to a new acute toxicity test on embryonic and juvenile organisms of the great pond snail ( Lymnaea stagnalis Linnaeus).
0 kommentar(er)
